- 9p-hackers: A mailing list for developers using 9P, to subscribe send an email to email@example.com
- 9fans: The main mailing list for all subjects related to Plan 9, including 9P.
- inferno-list: The main mailing list for Inferno and Limbo related topics.
9p in irc.freenode.net (and still sometimes in irc.oftc.net)
plan9 in irc.freenode.net
inferno in irc.freenode.net